:root { color-scheme: light dark; --bg: #fbfbf9; --text: #16181d; --muted: #555b66; --rule: #e4e4df; --accent: #1f4fbf; }
@media (prefers-color-scheme: dark) { :root { --bg: #111317; --text: #e8e9ec; --muted: #a3a8b3; --rule: #262a31; --accent: #8fb0ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: clamp(1.0625rem, 1rem + 0.25vw, 1.1875rem)/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif; }
header, main { max-width: 44rem; margin: 0 auto; padding: 1rem clamp(1rem, 4vw, 3rem); }
header { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.5rem 1.5rem; border-bottom: 1px solid var(--rule); max-width: none; }
header > a { font-weight: 650; color: var(--text); }
nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 1.25rem; }
main { padding-block: 2.5rem 4rem; }
h1 { font-size: clamp(1.75rem, 1.4rem + 1.4vw, 2.5rem); line-height: 1.15; letter-spacing: -0.015em; margin: 0 0 0.25rem; }
h1 + p { color: var(--muted); font-size: 0.875rem; margin-bottom: 2rem; }
h2 { font-size: 1.25rem; margin: 2rem 0 0.5rem; }
a { color: var(--accent); text-underline-offset: 0.2em; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }